diff --git a/contrib/sockets/sockets.lisp b/contrib/sockets/sockets.lisp
index a0bfa06c7..912c5c1b6 100644
--- a/contrib/sockets/sockets.lisp
+++ b/contrib/sockets/sockets.lisp
@@ -50,6 +50,12 @@
  "#endif"
  "#ifndef MSG_NOSIGNAL"
  "#define MSG_NOSIGNAL 0"
+ "#endif"
+ "#ifndef MSG_DONTWAIT"
+ "#define MSG_DONTWAIT 0"
+ "#endif"
+ "#ifndef MSG_EOR"
+ "#define MSG_EOR 0"
  "#endif")
 #+:wsock
 (clines